Science behind multi-axle load placement

Discussion in 'Heavy Haul Trucking Forum' started by jammerman, Sep 20, 2022.

  1. jammerman

    jammerman Bobtail Member

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    Forgive me if something similar has been ask/posted in the past but as I grow in HH, the pursuit of knowledge is a daily quest. What I am looking for is a best practice on how you determine where on the deck( beam or flat) you place the load? I understand that the Jeep plays on role in weight distribution/scaling out but what other factors are critical… let’s use a 4 axle tractor pulling an east coast 2/3/2 with a 120k load for example. - JammerMan
     
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  3. W923

    W923 Medium Load Member

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    Pressure guages on your air ride and some time at the cat scale or local elevator with a ground level platform scale. You can move your load around and see how things change and maybe figure out where you want the center of gravity to get the right distribution
    if you are loading tracked equipment it’s center of gravity is approximately where it tips at the top of the ramp. If it’s something loaded with a crane it’s directly under the crane hook assuming the object is hanging level.
     
  4. beastr123

    beastr123 Road Train Member

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    you can calculate the load c/g by using a formula to percentage of max load within friction tolerances.
    You need to weigh the complete unit as it is ready to load and then you can fill in the formula.
    max weight that can be carried on tractor and jeep (fw)
    max weight that can be carried on trailer and booster (rw)
    (fw) + (rw) = gross load weight
    (rw) divided by gross load weight = % load weight (rw%)
    now measure the distance from the trailer kingpin to the rear of the trailer (if a west coast measure to the trunion pivot(2) otherwise to the center axle of the trailer)
    now take the (rw%) of the total distance and measure from the kingpin
    that gives you the center of gravity for this unit.
    (rw%) (fw%)
    calculate weight.jpg
     
  5. jammerman

    jammerman Bobtail Member

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    Jan 23, 2020
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    Thank you Beast, I figured their was a formula to calculate since not everyone can eyeball and get the distribution right. This will be a big help!
     
    FerrissWheel, cke and beastr123 Thank this.
  6. beastr123

    beastr123 Road Train Member

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    Just to let you know the same formulas can be used for any trailer or combination of trailers. as long as you work on kingpin and center of the trailer axles (or the trunion pivot)
     
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